There is a de-clogger you can make to help clear clogs in the nozzle.

I got the rods from Amazon (https://www.amazon.com/gp/product/B07KY9JTC8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1). These are currently $6.99 for a 20 pack.

After inserting the rod I suggest using some 2 part epoxy resin to fill in the hole. The resin is great because it will seep into the pours in the model and make it extremely strong. If you don't use resin I suggest heading the rod until it is red hot at the end then pushing it into the hole as far as you can.